15     let (tx, rx) = mpsc::channel();  in join1()
17     assert_eq!(rx.recv(), Ok((1, 2)));  in join1()
18     assert!(rx.recv().is_err());  in join1()
27     let (tx, rx) = mpsc::channel();  in join2()
29     assert!(rx.try_recv().is_err());  in join2()
31     assert!(rx.try_recv().is_err());  in join2()
33     assert_eq!(rx.recv(), Ok((1, 2)));  in join2()
34     assert!(rx.recv().is_err());  in join2()
43     let (tx, rx) = mpsc::channel();  in join3()
45     assert!(rx.try_recv().is_err());  in join3()
47     assert_eq!(rx.recv(), Ok(1));  in join3()
48     assert!(rx.recv().is_err());  in join3()
58     let (tx, rx) = mpsc::channel();  in join4()
60     assert!(rx.try_recv().is_err());  in join4()
62     assert!(rx.recv().is_ok());  in join4()
64     assert!(rx.recv().is_err());  in join4()
74     let (tx, rx) = mpsc::channel();  in join5()
76     assert!(rx.try_recv().is_err());  in join5()
78     assert!(rx.try_recv().is_err());  in join5()
80     assert!(rx.try_recv().is_err());  in join5()
82     assert_eq!(rx.recv(), Ok(((1, 2), 3)));  in join5()
83     assert!(rx.recv().is_err());  in join5()
92     let (tx, rx) = mpsc::channel();  in select1()
94     assert!(rx.try_recv().is_err());  in select1()
96     let (v, p2) = rx.recv().unwrap().into_inner();  in select1()
98     assert!(rx.recv().is_err());  in select1()
100     let (tx, rx) = mpsc::channel();  in select1()
103     assert_eq!(rx.recv(), Ok(2));  in select1()
104     assert!(rx.recv().is_err());  in select1()
113     let (tx, rx) = mpsc::channel();  in select2()
115     assert!(rx.try_recv().is_err());  in select2()
117     let (v, p2) = rx.recv().unwrap();  in select2()
119     assert!(rx.recv().is_err());  in select2()
121     let (tx, rx) = mpsc::channel();  in select2()
124     assert_eq!(rx.recv(), Ok(2));  in select2()
125     assert!(rx.recv().is_err());  in select2()
134     let (tx, rx) = mpsc::channel();  in select3()
136     assert!(rx.try_recv().is_err());  in select3()
138     let (v, p2) = rx.recv().unwrap();  in select3()
140     assert!(rx.recv().is_err());  in select3()
142     let (tx, rx) = mpsc::channel();  in select3()
145     assert_eq!(rx.recv(), Ok(2));  in select3()
146     assert!(rx.recv().is_err());  in select3()
155     let (tx, rx) = mpsc::channel::<oneshot::Sender<i32>>();  in select4()
158         for c in rx {  in select4()